Re: Processor Overheating
Some processors (especially Intel) will shut themselves off at a high temperature regardless of BIOS settings. It's a safety feature and stops the CPU being damaged, you don't want to override that. You might be able to boot up into windows, but only briefly before the CPU gets fried.
My advice would be to try and resit the heatsink. disconnect it from the motherboard (it's usually either in the form of push plugs or screws) and then remove it from the cpu. Clean the old thermal paste off, put a new, thin layer on, re-attach and try again.